/**
 * @license Copyright (c) 2003-2023, CKSource Holding sp. z o.o. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */
import TableWalker from '../tablewalker';
/**
 * A table headings refresh handler which marks the table cells or rows in the differ to have it re-rendered
 * if the headings attribute changed.
 *
 * Table heading rows and heading columns are represented in the model by a `headingRows` and `headingColumns` attributes.
 *
 * When table headings attribute changes, all the cells/rows are marked to re-render to change between `<td>` and `<th>`.
 */
export default function tableHeadingsRefreshHandler(model, editing) {
    const differ = model.document.differ;
    for (const change of differ.getChanges()) {
        let table;
        let isRowChange = false;
        if (change.type == 'attribute') {
            const element = change.range.start.nodeAfter;
            if (!element || !element.is('element', 'table')) {
                continue;
            }
            if (change.attributeKey != 'headingRows' && change.attributeKey != 'headingColumns') {
                continue;
            }
            table = element;
            isRowChange = change.attributeKey == 'headingRows';
        }
        else if (change.name == 'tableRow' || change.name == 'tableCell') {
            table = change.position.findAncestor('table');
            isRowChange = change.name == 'tableRow';
        }
        if (!table) {
            continue;
        }
        const headingRows = table.getAttribute('headingRows') || 0;
        const headingColumns = table.getAttribute('headingColumns') || 0;
        const tableWalker = new TableWalker(table);
        for (const tableSlot of tableWalker) {
            const isHeading = tableSlot.row < headingRows || tableSlot.column < headingColumns;
            const expectedElementName = isHeading ? 'th' : 'td';
            const viewElement = editing.mapper.toViewElement(tableSlot.cell);
            if (viewElement && viewElement.is('element') && viewElement.name != expectedElementName) {
                editing.reconvertItem((isRowChange ? tableSlot.cell.parent : tableSlot.cell));
            }
        }
    }
}
